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Physics · Oct / Nov 2018 · Paper 12 · Question 25

5054Refraction of light

A student reads the following in her physics book. ‘The incident angle is greater than 42° which is the critical angle for glass in air.’ What is the student reading about?

  1. Afocal length of a glass lens
  2. Breflection in a plane mirror
  3. Crefraction as light enters glass
  4. Dtotal internal reflection

As printed in the paper

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Correct answer: D. total internal reflection

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